objective c - Determine when UITableViewCell is deallocated -
i using core data in app along nsfetchedresultscontroller populate table. database has 40k+ entries table rather long. each table cell has thumbnail image loaded web using sdwebimage . works great if scroll slowly, if begin scroll fast within couple of seconds crash. nszombies isn't showing useful. i'm guessing has sdwebimage , loading web. way sdwebimage works loading image in background setting downloaded image after completes downloading (wordy). thought cells being deallocated uitableview , sdwebimage tries set image on deallocated cell. if can determine when uitableviewcell going deallocated can stop sdwebimage downloading process , fix issue. i've tried add - (void)dealloc { nslog(@"dealloc"); } to catch when cell going deallocated never anything. edit have -(void)dealloc method in subclass uitableviewcell. edit here where/how create cell - (uitableviewcell *)tableview:(uitableview *)tableview cellforrowatindexpath:(nsindexpa